Sorption-catalytic determination of manganese directly on a paper-based chelating sorbent.
A hybrid technique based on a catalytic reaction carried out on the surface of a paper-based sorbent is proposed. It is shown that MnII exhibits its catalytic action in the oxidation of 3,3',5,5'-tetramethylbenzidine with periodate in aqueous solution as well as on filter-paper with or without attached diethylenetriaminetetraacetate (DETATA) groups. Optimum conditions differ for the reaction in solution and on filter-paper. For equal catalyst concentrations, higher initial reaction rates are attainable on the filter-papers. Preconcentration of manganese on the DETATA sorbent combined with the subsequent catalytic reaction improves the selectivity, reduces the limit of determination down to 5 x 10(-6) mg l-1 (as compared with 6 x 10(-5) mg l-1 in solution) and expands the linear range by an order of magnitude (to 5 x 10(-6)-2.5 x 10(-3) mg l-1). The precision of manganese determination on the sorbent is high (the RSDs are < or = 5% for > or = 6 x 10(-4) micrograms Mn). Samples of tap and river water were analyzed by use of the proposed sorption-catalytic technique. A rapid procedure for the determination of manganese with visual detection was also developed.
Beklemishev
M K
MK
Department of Chemistry, Moscow State University, Russia. mkb@analyt.chem.msu.su
Stoyan
T A
TA
Dolmanova
I F
IF
D002384:Catalysis; D002614:Chelating Agents; D008345:Manganese / Q000032:analysis*; D010209:Paper; D013053:Spectrophotometry; D014867:Water / Q000737:chemistry*
D002614:Chelating Agents; D014867:Water; D008345:Manganese